Signaling device



Nov. 7, 1933. E. DURST ET AL SIGNALING DEVICE Filed Nov. 24. 1928 Patented Nov. 7, i933 many, assignors to cohort, Stuttgart,

Application November and in Q6 1" Em li The pr invention reletestoscousticsigndh ing devices, particularly for motor vehicles, and more perticulerly of the type which hove e e phregm electro-magneticelly set in oscillation. 5, In signaling devices of this type the am.

ture oi the electro-magnet is usually connected with the diaphragm by means oi a bolt. In order to guide the bolt axially, it is either screwed or riveted to s guide spring or slides in e bush.

Both known types of construction possess certain disadvantages. The introduction oi the bolt rigidly connected with the guide spring is cum== bersonie, whilst the sliding guide dumps the vibrntions. it the bolt has too much play in the bush s the guidsnce oi the vibreting system is open to objection and vibrations can be set up which are not in the desired direction. It the play is smell excessive friction is set up thereby were dping the vibretions.

These disadvantages are overcome by the in vention which also introduces s considerable simplification of construction, in that the free end oi the eture bolt is, according to the invention mounted by means or" as pointed or 35 rounded end in a depression provided in n leei spring, preferably secured under tension at both ends.

One form of construction of the invention is shown in the eccomponying drawing in whlchz Figure l is s verticel central section of e signel ins device.

Figure 2 is e longitudinnl section oi the condo spri end,

3 is a plan view of the some.

The housing cc of the two portions c and b the sinuous diaphragm c being held at its edge between the houses of the se. Figure 1 only shows e portion of the mouth piece d. The electro-gnet e is mounted intheportionscithe lit? ' housing in sny suitable manner. The armature j of the electro-megnet is mounted on a, bolt 6 secured in the center of the diaphragm c. The

core is of the ct isboredlongitudinellvtherethrough to allow free passage of the armature bolt 4 g the top end of which is guided. For this purpose e lest spring i is provided heving holes it st both ends for its ettecent to the ho by means of screws m.

An impressed recess or bulge 12 into which the so pin o of the armature bolt projects is located cen trslly oi the leaf spring. The free end of the bolt is thereby guided. The leaf spring i is preferably tensioned by bending its ends downwards (see e 2) so that on tightening up the screws m the centred portion of the sprm is bent down 1328, S New 831,132,

words. By placing spring 5 under an initial ten= sion, the spring will follow the lree end oi the bolt in its vibratory movement end prevent the unsestinc of the bolt. Ii firm contest is not always maintained between spring 12 end the end of bolt 9 the quality of the sound emitted be impaired. By having the free end; of bolt C" rounded or pointed, the tension or spring 6 causes the bolt to remain firmly centered within the recess (n) and thereby prevent lateral vibrations oi the bolt. Instead of forming the recess it directly in the spring 5, it is obvious that it may be formed in a block carried by the least spring.

In order to be able to mount the leaf spring between the upper wall of the housing end the electro-megnet, the portion at or" the housingis provided at the top with e dished portion 52.

What we claim and desire to secure by Let tors Potent is:-

1. An acoustic signaling device comprising a,

housing, e diephregm mounted said housing, an electromegnet, en armature ior selcl electromegnet including o bolt member rig idly secured at one end to ssid diaphragm, end

at leer spring member secured to cold housing end flexed in the direction oi sold disphregm by e. fissure greater than the meximwn outward displacement of the diaphragm, said spring mem-- her and bolt member being provided with interecting means for supporting and maintaining sdf-centered the free end or said bolt member and preventing leteral movement between the bolt member and electromegnet while permitting longitudinal movement therebetween.

2. An acoustic :11: device comprising e ho. V; 1 a diaphragm mounted within said housing, an electromegnet, en ermeture for said electromsgnet including o. bolt member rigidly secured at one end to said diaphragm and having a. rounded free end, a. leaf spring member having e rounded recess for embracing the rounded free end of sold bolt member end supporting the e sgsinst lateral vibration, and means for securing said spring to said housing, said spring being flexed in the direction of said diephregm by e fissure greater then the maximum outward displacement of the diaphragm.

3. An acoustic signaling device comprising a housing, e diaphragm mounted wit seid hous= ing, an electroet, en erinsture for said clea tromegnet including o bolt member rigi se= cured at one end to said diephresm, e leaf spring secured to said housing and flexed in the direction of said diaphragm by e fissure greater then :o outward displacement of the die= rounded cup-shaped recess for engaging the rounded free end of said bolt and supporting the same against lateral vibration, and means for securing both ends of said spring to said housing, said spring being flexed in the direction of said diaphragm by a flexure greater than the maximum outward displacement of said diaphragm.

ERNST DURST. GEORG EHRET. 

